When they said "unflashable" they meant "newest firmware version".
You can't just write to the flash on any ol' psp. You need to have a Psp with an exploitable firmware.
You aren't supposed to be able to flash your psp in the first place.
How would they even make one "unflashable"? Make flash0 read-only? What do you think the past 10 firmwares have done? We have found ways around that via exploits.
And its impossible to make an "unflashable firmware". Partly because that would defeat the purpose of having an upgradeable firmware.
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